<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        div.center{
            width:1090px;
            margin:0 auto;
        }
       div.center header{
           width:100%;
           height:176px;
           background-color:red;
       }
       div.center article{
           height:800px;
           background-color:pink;
           /* border:3px solid red; */
           /* overflow:hidden; */
       }
       div.center header div{
           height:50px;
           border:3px solid orange;
       }
       /* div.center header div:nth-child(3){
           position:sticky;
           top:0px;
       } */
       div.center div.header-nav{
           height:50px;
           width:100%;
           border:3px solid blue;
           float:left;
           margin-top:112px;
           position:sticky;
           top:0px;
       }
       /* div.center article{
           display:inline-block;
           width:100%；
       } */
       div.center article section{
            width:100px;
            height:364px;
            background-color:green;
            margin-left:30px;
            margin-top:30px;
            position:sticky;
            top:70px;
            /* display:inline-block; */
       }
    </style>
</head>
<body>
    <div class="outer">
        <div class="center">
            <div class="header-nav"></div>
            <header>
                <div></div>
                <div></div>
            </header>
            <article>
                <section></section>
            </article>
            <footer></footer>
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        </div>
    </div>
</body>
</html>